He's talking about the theory that if you shoot someone in your home with your own rounds that a defense attorney might go after you. That has spread across the country on the www due to the self defense rounds made expressly to do big damage when they hit someone. It is sort of ridiculous as if you shoot somebody it sure isn't to give them a love tap and let them kill you after you fire a warning shot. If you don't intend to kill the intruder, then you shouldn't shoot to begin with and let them have a chance to do you in.